source: src/linux/universal/linux-4.9/arch/arm64/kernel/pci.c @ 31859

Last change on this file since 31859 was 31859, checked in by brainslayer, 6 weeks ago

kernel update

File size: 5.0 KB
Line 
1/*
2 * Code borrowed from powerpc/kernel/pci-common.c
3 *
4 * Copyright (C) 2003 Anton Blanchard <anton@au.ibm.com>, IBM
5 * Copyright (C) 2014 ARM Ltd.
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * version 2 as published by the Free Software Foundation.
10 *
11 */
12
13#include <linux/acpi.h>
14#include <linux/init.h>
15#include <linux/io.h>
16#include <linux/kernel.h>
17#include <linux/mm.h>
18#include <linux/of_pci.h>
19#include <linux/of_platform.h>
20#include <linux/pci.h>
21#include <linux/pci-acpi.h>
22#include <linux/pci-ecam.h>
23#include <linux/slab.h>
24
25/*
26 * Called after each bus is probed, but before its children are examined
27 */
28void pcibios_fixup_bus(struct pci_bus *bus)
29{
30        /* nothing to do, expected to be removed in the future */
31}
32
33/*
34 * We don't have to worry about legacy ISA devices, so nothing to do here
35 */
36resource_size_t pcibios_align_resource(void *data, const struct resource *res,
37                                resource_size_t size, resource_size_t align)
38{
39        return res->start;
40}
41
42/*
43 * Try to assign the IRQ number when probing a new device
44 */
45int pcibios_alloc_irq(struct pci_dev *dev)
46{
47        if (acpi_disabled)
48                dev->irq = of_irq_parse_and_map_pci(dev, 0, 0);
49#ifdef CONFIG_ACPI
50        else
51                return acpi_pci_irq_enable(dev);
52#endif
53
54        return 0;
55}
56
57/*
58 * raw_pci_read/write - Platform-specific PCI config space access.
59 */
60int raw_pci_read(unsigned int domain, unsigned int bus,
61                  unsigned int devfn, int reg, int len, u32 *val)
62{
63        struct pci_bus *b = pci_find_bus(domain, bus);
64
65        if (!b)
66                return PCIBIOS_DEVICE_NOT_FOUND;
67        return b->ops->read(b, devfn, reg, len, val);
68}
69
70int raw_pci_write(unsigned int domain, unsigned int bus,
71                unsigned int devfn, int reg, int len, u32 val)
72{
73        struct pci_bus *b = pci_find_bus(domain, bus);
74
75        if (!b)
76                return PCIBIOS_DEVICE_NOT_FOUND;
77        return b->ops->write(b, devfn, reg, len, val);
78}
79
80#ifdef CONFIG_NUMA
81
82int pcibus_to_node(struct pci_bus *bus)
83{
84        return dev_to_node(&bus->dev);
85}
86EXPORT_SYMBOL(pcibus_to_node);
87
88#endif
89
90#ifdef CONFIG_ACPI
91
92struct acpi_pci_generic_root_info {
93        struct acpi_pci_root_info       common;
94        struct pci_config_window        *cfg;   /* config space mapping */
95};
96
97int acpi_pci_bus_find_domain_nr(struct pci_bus *bus)
98{
99        struct pci_config_window *cfg = bus->sysdata;
100        struct acpi_device *adev = to_acpi_device(cfg->parent);
101        struct acpi_pci_root *root = acpi_driver_data(adev);
102
103        return root->segment;
104}
105
106int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
107{
108        if (!acpi_disabled) {
109                struct pci_config_window *cfg = bridge->bus->sysdata;
110                struct acpi_device *adev = to_acpi_device(cfg->parent);
111                ACPI_COMPANION_SET(&bridge->dev, adev);
112        }
113
114        return 0;
115}
116
117/*
118 * Lookup the bus range for the domain in MCFG, and set up config space
119 * mapping.
120 */
121static struct pci_config_window *
122pci_acpi_setup_ecam_mapping(struct acpi_pci_root *root)
123{
124        struct device *dev = &root->device->dev;
125        struct resource *bus_res = &root->secondary;
126        u16 seg = root->segment;
127        struct pci_config_window *cfg;
128        struct resource cfgres;
129        unsigned int bsz;
130
131        /* Use address from _CBA if present, otherwise lookup MCFG */
132        if (!root->mcfg_addr)
133                root->mcfg_addr = pci_mcfg_lookup(seg, bus_res);
134
135        if (!root->mcfg_addr) {
136                dev_err(dev, "%04x:%pR ECAM region not found\n", seg, bus_res);
137                return NULL;
138        }
139
140        bsz = 1 << pci_generic_ecam_ops.bus_shift;
141        cfgres.start = root->mcfg_addr + bus_res->start * bsz;
142        cfgres.end = cfgres.start + resource_size(bus_res) * bsz - 1;
143        cfgres.flags = IORESOURCE_MEM;
144        cfg = pci_ecam_create(dev, &cfgres, bus_res, &pci_generic_ecam_ops);
145        if (IS_ERR(cfg)) {
146                dev_err(dev, "%04x:%pR error %ld mapping ECAM\n", seg, bus_res,
147                        PTR_ERR(cfg));
148                return NULL;
149        }
150
151        return cfg;
152}
153
154/* release_info: free resources allocated by init_info */
155static void pci_acpi_generic_release_info(struct acpi_pci_root_info *ci)
156{
157        struct acpi_pci_generic_root_info *ri;
158
159        ri = container_of(ci, struct acpi_pci_generic_root_info, common);
160        pci_ecam_free(ri->cfg);
161        kfree(ci->ops);
162        kfree(ri);
163}
164
165/* Interface called from ACPI code to setup PCI host controller */
166struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
167{
168        int node = acpi_get_node(root->device->handle);
169        struct acpi_pci_generic_root_info *ri;
170        struct pci_bus *bus, *child;
171        struct acpi_pci_root_ops *root_ops;
172
173        ri = kzalloc_node(sizeof(*ri), GFP_KERNEL, node);
174        if (!ri)
175                return NULL;
176
177        root_ops = kzalloc_node(sizeof(*root_ops), GFP_KERNEL, node);
178        if (!root_ops)
179                return NULL;
180
181        ri->cfg = pci_acpi_setup_ecam_mapping(root);
182        if (!ri->cfg) {
183                kfree(ri);
184                kfree(root_ops);
185                return NULL;
186        }
187
188        root_ops->release_info = pci_acpi_generic_release_info;
189        root_ops->pci_ops = &ri->cfg->ops->pci_ops;
190        bus = acpi_pci_root_create(root, root_ops, &ri->common, ri->cfg);
191        if (!bus)
192                return NULL;
193
194        pci_bus_size_bridges(bus);
195        pci_bus_assign_resources(bus);
196
197        list_for_each_entry(child, &bus->children, node)
198                pcie_bus_configure_settings(child);
199
200        return bus;
201}
202
203void pcibios_add_bus(struct pci_bus *bus)
204{
205        acpi_pci_add_bus(bus);
206}
207
208void pcibios_remove_bus(struct pci_bus *bus)
209{
210        acpi_pci_remove_bus(bus);
211}
212
213#endif
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